The itching you describe is if because of some sort of fungal infection
, than the medication prescribed to you appears to be allright and if the itching is bacuse of some other reason, than these medication is not going to help you much.
The medication you are prescibed are mainly for the fungal infection and it is given for long duration than what you are prescibed for.
As far as gastric upset is concern, if you feel some problem with these medication than you can take something for that, but should avoid taking both at the same time.
Thanks and take care